Who has been the single-most influential person in the history of humanity? Why?

Although the impact of his "dangerous idea" is not even spread completely, it is the best example of a good theory that can overthrow wrong ideas about reality.
And as for all his other contributions, read "The voyage of the Beagle". It is a masterpiece of wonder and discovery. Of a universal curious mind that found some great explanations of some of world's phenomena...

Oct 20 2011:
Jesus Christ- Here is why...Who, being in very nature God, did not consider equality with God something to be used to his own advantage; rather, he made himself nothing by taking the very nature of a servant, being made in human likeness. And being found in appearance as a man, he humbled himself by becoming obedient to death— even death on a cross!

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Oct 21 2011:
@Matthieu- I respect your opinion. Gandi would be my second pick. I am not going to waste time defending my choice because this isnt a "debate" thread - I do not care much who agrees or not.

Oct 20 2011:
After thinking hard I believe there is no single person that had the biggest impact on human history. In general I think many scientists, educators and peace promoting indiiduals would deserve such recognition. Perhaps individuals given Nobel price can be considered with most impact on our history and societies?

Oct 21 2011:
Its hard to say being that there have been so many people who has had an influence on the world. I really can't narrow it down to one being that anyone we pick was indeed influenced by their contemporaries and those before them.

I do find it funny that Jesus was mentioned. In that case I would have to say Dionysus